Change goods Issue date and delivery date

Question

while crating Sales document through VA01
i want  to replace goods issue date (VBEP-WADAT ) with my Z calender date.
so that delivery date(ETDAT) aslo should chaged automatically ( bcz iof the change in goods isuue date ).
how to achive this ?
i tryied in  Program    program of MV45AFZZ/ MV45AFZB in the User Exists mentioned below:
1.     Form Userexit_Check_VBEP
2.     Form userexit_move_field_to_vbep
i was able to change goods issue date (VBEP-WADAT )  but  not refleting in output screen,..
regards,
ramesh

Answer 1

Hi Venkat,
  Even it did not update in my user exit when I update from VBEP-WADAT.  So, I did back calculation (considering route lead time) and updated Delivery date field VBEP-EDATU.  It is simple.  I have given the sample code as below.
   if lines( xvbap[] ) = 1 and VBEP-ETENR = '0001' and            "Calculate RDD while the first line item entered
     vbap-route <> space and <<your GI date>> is not initial.    "Only when header RSD is filled
      select single TRAZTD into ws_traztd from tvro
            where route = vbap-route.
      ws_days = ws_traztd / 24 / 10000.
      if ws_days <> 0.    "Only when Transp. Lead time is maintained ( So, will not affect other entities )
         select single FABKL into ws_fabkl from T001W
            where WERKS = vbap-werks.
         CALL FUNCTION 'WDKAL_DATE_ADD_FKDAYS'       "Calculate as per Factory calender
             EXPORTING
               i_date        = <<your GI date>>
               i_fkday       = ws_days
               i_fabkl       = ws_fabkl
             IMPORTING
               E_DATE        = ws_date
              E_FKDAY       =
             EXCEPTIONS
                ERROR         = 1
                OTHERS        = 2
         IF sy-subrc = 0.
            VBEP-EDATU = vbak-vdatu.   "copy to the first line item
         ENDIF.
      endif.
    endif.    "Route days